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Old 08-25-2009, 01:54 PM   #1
snaus32
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327 engine

Hi all finally pulled the 327 out of the doner truck i bought a few months ago only 65k on it! I was wondering how i know what the numbers meen on the block they read 3914678? can anyone decode
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Old 08-25-2009, 02:14 PM   #2
nsuengineer06
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Re: 327 engine

That casting number comes up as a 1968-69 302 from a Z-28 Camaro with either 2 or 4 bolt mains..

Block ID Page

Mortec ID Page
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2003 GMC Sierra 2500HD Crew 4x4 6.6L Duramax/Allison
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Old 08-25-2009, 02:25 PM   #3
snaus32
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Re: 327 engine

also these ?
3914678 302 290 - 2/4 Camaro, Z-28
1968-69 3914678 327 210 295 4 car, truck
1968 3914678 350 210 295 4 cars
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Old 08-25-2009, 02:31 PM   #4
nsuengineer06
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Re: 327 engine

Got me on that one!? I have read that the 302 is the same as a 327 except it uses a 283 crank. Which gives a 3.00" stroke. I guess if all else fails you can measure the stroke to see if it is a 302 or 327?

What sites did you use to get those numbers?
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1967 C10 LWB 454/TH400
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1984 C30 LWB Dually 454/4 spd 4:10
2003 GMC Sierra 2500HD Crew 4x4 6.6L Duramax/Allison
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Old 08-25-2009, 02:33 PM   #5
nsuengineer06
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Re: 327 engine

Oh I see.. lol

I suppose the block is the same for all three.. Only difference is the stroke.
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2003 GMC Sierra 2500HD Crew 4x4 6.6L Duramax/Allison
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